Gmail接口.NET:如何向一个发送者请求消息

using Google.Apis.Auth.OAuth2;
using Google.Apis.Gmail.v1;
using Google.Apis.Gmail.v1.Data;
using Google.Apis.Services;

// 配置OAuth 2.0凭据
UserCredential credential;
using (var stream = new FileStream("path_to_credentials.json", FileMode.Open, FileAccess.Read))
{
    credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
        GoogleClientSecrets.Load(stream).Secrets,
        new[] { GmailService.Scope.GmailReadonly },
        "user",
        CancellationToken.None).Result;
}

// 进行身份验证
var service = new GmailService(new BaseClientService.Initializer()
{
    HttpClientInitializer = credential,
    ApplicationName = "Gmail API .NET",
});

// 发送请求
var messageId = "message_id";
var request = service.Users.Messages.Get("me", messageId);
var message = request.Execute();

// 处理返回的消息
Console.WriteLine("Subject: " + message.Payload.Headers.FirstOrDefault(h => h.Name == "Subject")?.Value);
Console.WriteLine("From: " + message.Payload.Headers.FirstOrDefault(h => h.Name == "From")?.Value);
Console.WriteLine("Snippet: " + message.Snippet);